failures int
	// If the poller has passed the bootstrap phase. The poller is considered
	// bootstrapped either bootstrapGracePeriod after the first call of
	// configuration(), or when setConfigurationAndReady() is called, whichever
	// comes first.
	bootstrapped bool
	// configuration() retries bootstrapRetries times if poller is not bootstrapped
	// read-only
	bootstrapRetries int
	// Grace period for bootstrapping